Captain Zaharie Amhad Shah may have intentionally downed the plane although investigators cannot rule out the theory that the jet was hijacked

WHICH ARE THE MAIN THEORIES OF MH370 DISSAPEARANCE?

Pilot or co-pilot suicide: Captain Zaharie Ahmad Shah may have intentionally downed the plan in an act of murder-suicide. The report shows the aircraft was deliberately turned off course but investigators say they found nothing irregular with Shah’s background, training and mental health. MH370 may have also been downed by the co-pilot. Fariq Abdul Hamid was on his first flight on a 777 as a fully approved first officer.

Hijacking: Chief investigator says they cannot rule out a ‘third party’ hijacking the plane it. However, no terror group has claimed responsibility for the crash and there is no evidence that the aircraft was being controlled ‘remotely’. Also the report shows that none of the passengers had experience of flying a plane

Fire or fumes: One theory is that transporting lithium-ion batteries could have caused the fire. These batteries, which are used in cell phones and laptops may have exploded or have been set alight. A haul of tropical fruit which was off-season could have reacted with the batteries – causing them to ignite or create hazardous fumes

Hypoxia: Passengers and crew would have been incapacitated by an unknown hypoxia event – which is a deficiency of oxygen in the cabin. This theory claims that captain Zaharie would have been unconscious for hours.

However the report by the official safety investigation team has not assigned blame to any individuals and has not been able to determine why the plane changed course and eventually crashed - leaving the mystery unsolved.

The Malaysian government will only re-open their investigation if new evidence emerges.

Chief investigator Dr Kok Soo Chon told reporters that his team believe the Malaysian Airlines plane was under manual control and was intentionally downed.

He said: "We cannot establish if the aircraft was flown by anyone other than the pilot."

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“We can also not exclude the possibility that there’s unlawful interference by a third party", reports News.com.au.

Speaking about why the aircraft deviated thousands of miles from its course, he said: “The autopilot has to be disengaged,” reports Adelaide Now.

He continued: “It has to be on manual. We have carried out seven simulator tests, flight simulators, three at high and four at low speed and we found the turn was made indeed under a manual, not autopilot.”